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( 3x - 2 )² = 9x² - 12x + 4
El del segundo es :
(3x + 2 )² = 9x² + 12x +4
Si sumamos ambos resultados obtenemos
9x² -12x + 4 + 9x² + 12x + 4 = 18x² + 8 (12x se eliminó )